So I am currently working on a setting to take place in my own version of the Darklands/Underdark/What-have-you and I don't want to use any of the existing Darkland races purely because I feel like the same underground races get old after awhile and I like it when people are guessing as to what could show up instead of assuming they will fight Trogs, and Drow, and various short angry greyskinned people.
I actually have quite a bit of work done on the setting but I would like to add two or three more sentient races. All my current intelligent beings are either original things I have made before that I have adapted in or are inspired by various works of fiction from Marvel comics to The Wizard of Oz and several things in between.
What I actually want help with is I want to do is to have 2-3 races being existing PC races that have the typical subterranean treatment. Just like Elves-> Drow, Dwarves->Duergar, Lizardfolk->Troglodytes, Gnomes->Svirfneblin and so on. But i can't decide what races should get that treatment and I am looking for interesting suggestions to spark some creativity. What races would you like to see a Darklands version of? Any PC race or any humanoid/Monstrous humanoid that isn't too crazy that you think would make a really weird or cool addition if Subterranean-ified